Prefab home transport from the Port of Barcelona: what to know before the ship arrives

That last leg is what this guide covers. The pattern repeats: the buyer has sorted out the house, the payment, the ship and customs, which look like the hard part, and then finds that transport from the port has rules of its own. What fits on a standard truck and what needs special transport. Which permits apply. Why a load that crossed the ocean without trouble can't carry on as it is along the motorway. Who supplies the crane at the destination. What the plot needs for the truck to get in. It's all here, in the order you should think about it: before the ship arrives.

First, what type of house is coming: they don't all travel the same way

"Prefab home" is a label that covers very different things when it comes to transport. The manufacturer's spec sheet decides everything else, and the figures that count are the transport dimensions, not those of the assembled house:

The first row is the good news many buyers don't know. An expandable house, folded, fits within container dimensions. It travels by sea as a container and by road like any other truckload, with no special permits and no surcharges, and it unfolds once it is on the plot. The third row is the other side of the coin: on the road, an assembled module 3 metres wide or more is an oversized load, with a regime of its own.

A folded module travels like any other container; an assembled module travels as special transport. The difference is in the manufacturer's transport sheet, and in the quote.

What fits on a low-loader, and which permits you need

The general limits for road traffic in Spain are 2.55 metres in width and 4 metres in height, with masses of up to 44 tonnes depending on configuration (Anexo IX, Reglamento General de Vehículos, the General Vehicle Regulations). Anything that fits inside them, such as a folded expandable house or packs of panels, travels with no paperwork. Anything that sticks out becomes special transport and needs an ACC (Autorización Complementaria de Circulación, the supplementary circulation authorization). The carrier applies for it: the Servei Català de Trànsit issues it for the Catalan stretch and, if the journey leaves Catalonia, the DGT (Spain's national traffic authority) also issues one for the rest of the route. An ACC is granted for an indivisible load, and an assembled housing module is one: there is no reasonable way to split it.

With a prefab home, the dimension that almost always decides things is width. A housing module is designed around the rooms inside it, and rooms want 3 or 4 metres. Width works in steps, each with its own paperwork and its own cost:

• Up to 2.55 metres: standard transport, no authorization.
• Above 2.55 and up to 3 metres: special transport under a generic ACC, the fast category, which covers vehicle combinations of up to 20.55 × 3 × 4.5 metres and 45 tonnes.
• Above 3 metres in width, or 20.55 metres in combination length: the file moves up to a specific ACC (up to 40 × 5 × 4.7 metres). That means a sketch of the combination, notice of the start of the journey, longer lead times and a pilot vehicle under Anexo III, Reglamento General de Circulación (RD 1428/2003). This is where the typical 3–4 metre module sits: routine for a specialist carrier, but with a serious file behind it.
• Above 5 metres in width: the exceptional category, with an escort from the Mossos d'Esquadra (the Catalan police) on Catalan roads. This is the territory of extreme pieces. It is rare in modular housing, but it happens.

The carrier proposes and arranges all of this, and it is included in the quote. Height is a different matter, because the trailer solves it. The bed of a low-loader sits 30–40 centimetres off the ground, so a module 3.3–3.5 metres high travels under the 4-metre limit, or very close to it. Length is rarely a problem: an extendable trailer handles long modules easily. One caveat: length and height are decided together, because the extendable trailer that solves a long module rides higher than a low-loader. A module that is both long and tall means choosing the configuration with both figures on the table.

Two things to know about the calendar. The authorization takes time to process (days, not hours, depending on the category), and special transport is subject to an annual calendar of restrictions that rules out certain days and time slots. So plan the delivery date with the carrier before you commit to it with the installer.

the complete guide to oversized containers and cargo from the Port of Barcelona →

The sea leg is on a flat rack, and that is where the height problem starts

Modules that don't fit in a closed container travel by sea on a flat rack, a container platform with no roof or side walls, or as project cargo in the hold. That works fine for the ship. The problem appears on arrival. The base of a 40-foot flat rack raises the load by some 63–65 centimetres. If the module stays on it for the road leg, flat rack on its chassis, the combination stacks module, base and chassis and easily ends up well above the limits. A module 3 metres high can come to more than 4.5 metres overall. That is no longer a simple permit file. It is a route study in which the real bridges and tunnels set the limit.

The fix has a name and is routine at the port: transloading. The module is lifted off the flat rack inside the port area and set directly on the low-loader. The empty flat rack goes back to the shipping line that same day, which also stops the clock on equipment detention charges, and the module wins back the height of the base in one move. Often that is the difference between a fast permit and a long, expensive one. One detail few people know: inside the port area, the Port Authority's own rules apply as well. The special movement is authorized separately and, in its specific category, requires a Port Police escort and an application 48 hours in advance. That is one more procedure the carrier takes care of. We have a whole guide on this operation:

transloading at the port: when it pays to take the load off the flat rack, and how much height you recover →

The house that crossed half the world by ship can get stuck in the last twenty metres: access to the plot decides more projects than the ocean does.

The customer arranges the crane at the destination, and it pays to know that from the start

This is the most expensive misunderstanding in the sector, so we'll say it plainly: the truck transports; the crane unloads, and the customer hires the crane, usually through their builder or installer. The carrier delivers the module alongside the vehicle. Lifting it over the fence and setting it on the foundations is a site operation. It takes a mobile crane sized for the module's weight and the reach required, standing on firm, level ground where the outriggers can be set.

What we do is coordinate: the truck's arrival time with the crane's, the order of the modules when there are several, and the handover itself, so that the module goes from trailer to foundations in a single lift. A module waiting for a crane that didn't turn up is a truck standing idle, and that gets invoiced. So does a crane waiting for a badly scheduled truck. Coordination is free. The lack of it is not.

One more note, because the question always comes up. The transport permits (the ACC) are handled by the carrier. Permission to install the house on the plot is a planning matter between the owner and the town hall (licencia urbanística), separate from the transport and needed beforehand. They are two different worlds, and the second should be settled before the house is loaded on the ship.

Access to the plot: where projects are decided

This is the point that complicates more projects than the ship or the permits. A low-loader is long, heavy and very low: what makes it work on the motorway holds it back on a dirt track. Steep ramps catch the chassis. Soft or muddy ground won't carry the loaded combination. Tight bends between walls or trees don't leave enough turning radius. And a narrow track with no room to turn makes the delivery a problem with no good solution.

So the recommendation is simple and worth a lot: prepare the plot before the house arrives. Specifically:

• A compacted, passable access route from the paved road to the unloading point: wide enough, free of sharp ramps, on ground that takes the weight.
• Room to turn: the combination needs space to enter, position itself and leave. A dead end with no way to turn around is a bad plan.
• A firm, level area for the crane, with space to extend the outriggers next to the assembly point.

When access is impossible for the low-loader, there are alternatives, such as unloading at the nearest accessible point and covering the last stretch by other means. All of them add handling, time and cost. The cheap, calm version is always the same: a prepared plot. If you have doubts, send us photos of the access with your request. Three photos show more than ten emails.

How much it costs to transport a prefab home: the factors

Everyone asks, and the short answer is that there is no flat rate. There are factors, and it's worth knowing them because several are in the buyer's hands.

• Distance from the port to the plot: the base factor.
• Width, above all, because it sets the permit category. A module within 2.55 metres travels as standard transport; one above that needs an ACC; an extreme one needs a long permit file. Each step up in category is a step up in cost and lead time.
• Escort: above 3 metres in width, the normal case for a housing module, the pilot vehicle is part of the operation. It is quoted from day one and doesn't turn up later as a surprise.
• Transloading at the port, if the module arrives on a flat rack and its height means moving it onto the low-loader. It is a crane operation that costs less than the permit file it avoids.
• Number of modules: an authorization is processed for each vehicle combination, but trips can be grouped in a convoy when the authorization allows it, which lowers the escort cost compared with separate trips.
• Time at the port: the shipping line's free days are limited, and a badly planned collection brings storage and equipment detention charges.
• Access to the plot, as described above: a clean delivery costs what was quoted. An improvised one doesn't.

The good news: almost all of these factors can be fixed before you sign, with the right data. Which brings us to the next point.

How to ask for a quote and get it right the first time

With the data below, a transport quote for a prefab home comes back complete within 24 business hours, at a fixed price for the scope described:

1. Transport dimensions of each module (length × width × height at the outermost points, packaging included) and its weight. They're on the manufacturer's spec sheet; ask for it.
2. How it travels by sea: closed container, flat rack or break-bulk? Your freight forwarder or the seller will know.
3. Port and terminal of arrival, and the vessel's estimated dates.
4. Exact address of the plot and, strongly recommended, photos of the access.
5. Who supplies the crane at the destination, and who the site contact is.
6. Number of modules, and whether there is an assembly order.
7. Dates: when the installer wants the house on the plot.
8. Anything unusual: a module with overhangs, fragile cargo, a street with access restrictions.

With that, the carrier can tell you, and commit to, the trailer, the permit, the lead time and the price.

the complete guide for freight forwarders and professionals: how to quote an OOG load right the first time →

How we handle it at Pastor

Sixty years of family tradition in special transport from the Port of Barcelona, and a line of work that fits this wave: cargo that arrives by sea and doesn't fit on a standard truck. Port operations are sorted in advance: we are registered with Portic and with the terminals in the port area. Our own fleet, a conventional low-loader and an extendable trailer, is what a housing module needs. And transloading from a flat rack is routine quayside work for us.

With the buyer or the distributor, we start from the manufacturer's spec sheet. We work out the whole file (module, trailer, permit, route, calendar) before the ship arrives, propose transloading when the height calls for it, and coordinate the delivery with the crane and the installer. If the plot raises doubts, we resolve them from photos and, when necessary, on site. Our home ground is Catalonia, the Ebro Corridor and the south of France. For destinations further afield, we say so in the first conversation.

For someone who has bought a house on the other side of the world, the promise is the one this firm has put its name to for sixty years: the last few kilometres won't be the hardest. The buyer has one point of contact: us.

the complete guide to special transport through the Port of Barcelona in 2026 →